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docs(server,examples): document extension capabilities with a runnable example (#2387)

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Felix Weinberger 2026-06-29 17:02:22 +01:00 • committed by GitHub
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docs/client.md
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@ -166,6 +166,20 @@ const systemPrompt = ['You are a helpful assistant.', instructions].filter(Boole
console.log(systemPrompt);
```
### Extension capabilities
The negotiated server capabilities include `extensions` — a map from extension identifier to that extension's settings object. Read it after connecting via {@linkcode @modelcontextprotocol/client!client/client.Client#getServerCapabilities | client.getServerCapabilities()}:
```ts source="../examples/guides/clientGuide.examples.ts#extensionCapabilities_read"
const extensions = client.getServerCapabilities()?.extensions ?? {};
if ('com.example/feature-flags' in extensions) {
// Advertised on this connection; the entry's value is its settings object.
}
```
See [Extension capabilities](./server.md#extension-capabilities) in the server guide for the declaring side.
## Authentication
MCP servers can require authentication before accepting client connections (see [Authorization](https://modelcontextprotocol.io/specification/latest/basic/authorization) in the MCP specification). Pass an {@linkcode @modelcontextprotocol/client!client/auth.AuthProvider |